import random

def say_hello():  #无参无返回
    print("hello")
    print("hello")
    print("hello")
    
#无参有返回
def rand():
    return random.randint(0,10)

#有参无返回
def hi(name):
    print("你好：",name)
    
#有参有返回
def sum(a,b):
    return a + b

say_hello()
print(rand())
hi("小米")
print(sum(5,6))